Hi Maritza,

Thank you for your question about Xstamper Refill Ink.

Xstamper ink does not expire. As long as you keep the bottle closed when you aren't using it, it should last until it runs out. 

If the bottle isn't properly closed after use, it will dry out and become thick and gloppy, at which point you'll need to buy a new bottle. 

Hope this answers your question!

Best,
Frankye